<template xmlns:v-on="http://www.w3.org/1999/xhtml"
          xmlns:v-bind="http://www.w3.org/1999/xhtml">
    <div class="page-bar">
        <div class="page-size">
            <div>
                <select v-on:change="menuChange()" v-model="limit">
                    <option v-for="item in menu" v-bind:value="item">{{item}}</option>
                </select>
                记录/页，显示第 {{start}} 至 {{end}} 项记录，共 {{totalSize}} 项
            </div>
        </div>
        <div class="page-con">
            <ul>
                <li><a v-on:click="firstClick()" v-bind:class="{ 'disabled': cur == 1}">首页</a></li>
                <li><a v-on:click="preClick()" v-bind:class="{ 'disabled': cur == 1}">上一页</a></li>
                <li v-for="per in pages" v-bind:class="{ 'active': cur == per}">
                    <a v-on:click="pageClick(per)">{{ per }}</a>
                </li>
                <li><a v-on:click="nextClick()" v-bind:class="{ 'disabled': cur == totalPage}">下一页</a></li>
                <li><a v-on:click="lastClick()" v-bind:class="{ 'disabled': cur == totalPage}">尾页</a></li>
                <li><a>共<i>{{totalPage}}</i>页</a></li>
            </ul>
        </div>
        <div class="clear-both"></div>
    </div>
</template>

<script>
    import Ajax from '../ajax'

    export default{
        props: ['page-model'],
        data () {
            return {
                // 初始页
                cur: 1,
                // 请求地址
                url: this.pageModel.url ? this.pageModel.url : "",
                // 请求参数
                param: this.pageModel.param ? this.pageModel.param : {},
                // 请求方法 默认为GET请求
                method: this.pageModel.method ? this.pageModel.method : 'GET',
                // 每页显示数量 默认每页显示10条
                limit: this.pageModel.menu ? this.pageModel.menu[0] : 10,
                // 底部分页基数 默认5
                perSize: this.pageModel.perSize ? this.pageModel.perSize : 5,
                // 每页显示数量 下拉选项
                menu: this.pageModel.menu ? this.pageModel.menu : [5, 10, 50],
                // 分页参数 自定义名称
                pageParamName: this.pageModel.pageParamName ? this.pageModel.pageParamName : ['page', 'limit'],
                // 当前列表显示记录起始数
                start: 0,
                // 当前列表显示记录结束数
                end: 0,
                // 总页数
                totalPage: 0,
                // 记录总数
                totalSize: 0,
                // 分页请求返回数据
                dataList: []
            }
        },
        ready () {
            this.getData();
        },
        methods: {
            // 首页
            firstClick: function () {
                if (this.cur > 1) {
                    this.cur = 1;
                    this.getData();
                }
            },
            // 尾页
            lastClick: function () {
                if (this.cur < this.totalPage) {
                    this.cur = this.totalPage;
                    this.getData();
                }
            },
            // 上一页
            preClick: function () {
                if (this.cur > 1) {
                    this.cur--;
                    this.getData();
                }
            },
            // 下一页
            nextClick: function () {
                if (this.cur < this.totalPage) {
                    this.cur++;
                    this.getData();
                }
            },
            // 页码
            pageClick: function (data) {
                if (data != this.cur) {
                    this.cur = data;
                    this.getData();

                }
            },
            // 刷新显示记录数
            refreshPageCon: function () {
                this.start = (this.cur - 1) * this.limit + 1;
                if (this.totalSize >= this.limit * this.cur) {
                    this.end = this.limit * this.cur;
                } else {
                    this.end = this.totalSize;
                }
            },
            // 分页请求
            getData: function () {
                let _this = this;
                this.param[this.pageParamName[0]] = this.cur;
                this.param[this.pageParamName[1]] = this.limit;
                Ajax({
                    url: _this.url,
                    method: _this.method,
                    data: _this.param,
                    callback: function (res) {
                        // 返回结果数据集
                        this.dataList = res.data;
                        // 返回总记录数
                        _this.totalSize = 25;

                        _this.totalPage = Math.ceil(_this.totalSize / _this.limit);
                        _this.refreshPageCon();
                        _this.$dispatch('refresh', this.dataList);
                    }
                });
            },
            // 每页显示记录数 下拉
            menuChange: function () {
                this.getData();
            },
            getPage: function (curPage, totalPage, pageNum) {
                var leftPage, rightPage;
                curPage = curPage > 1 ? curPage : 1;
                curPage = curPage > totalPage ? totalPage : curPage;
                totalPage = curPage > totalPage ? curPage : totalPage;
                // 左侧页数
                leftPage = curPage - Math.floor(pageNum / 2);
                leftPage = leftPage > 1 ? leftPage : 1;

                // 右侧页数
                rightPage = curPage + Math.floor(pageNum / 2);
                rightPage = rightPage > totalPage ? totalPage : rightPage;

                var curPageNum = rightPage - leftPage + 1;
                // 左侧调整
                if (curPageNum < pageNum && leftPage > 1) {
                    leftPage = leftPage - (pageNum - curPageNum);
                    leftPage = leftPage > 1 ? leftPage : 1;
                    curPageNum = rightPage - leftPage + 1;
                }

                // 右侧调整
                if (curPageNum < pageNum && rightPage < totalPage) {
                    rightPage = rightPage + (pageNum - curPageNum);
                    rightPage = rightPage > totalPage ? totalPage : rightPage;
                }

                var arr = [];
                for (var i = leftPage; i <= rightPage; i++) {
                    arr.push(i);
                }
                return arr;
            }
        },
        computed: {
            pages: function () {
                return this.getPage(this.cur, this.totalPage, this.perSize);
            }
        }
    }
</script>

<style>
    ul, li {
        margin: 0px;
        padding: 0px;
    }

    li {
        list-style: none;
        display: inline;
    }

    .page-bar li:first-child > a {
        margin-left: 0px
    }

    .page-bar a {
        border: 1px solid #ddd;
        text-decoration: none;
        position: relative;
        float: left;
        padding: 6px 12px;
        margin-left: -1px;
        line-height: 1.42857143;
        color: #337ab7;
        cursor: pointer;
    }

    .page-bar a:hover {
        background-color: #eee;
    }

    .page-bar .active a {
        color: #fff;
        cursor: default;
        background-color: #337ab7;
        border-color: #337ab7;
    }

    .page-bar i {
        font-style: normal;
        color: #d44950;
        margin: 0px 4px;
        font-size: 12px;
    }

    .page-bar .page-con, .page-size {
        width: 50%;
        display: block;
        height: 30px;
        float: left;
        line-height: 30px;
    }

    .page-bar .page-con ul {
        float: right;
        padding-left: 15px;
        padding-right: 15px;
        display: inline-block;
        padding-left: 0;
    }

    .page-bar .page-size div {
        padding-left: 15px;
        padding-right: 15px;
        font-size: 14px;
    }

    a.disabled {
        color: #777;
        background-color: #fff;
        border-color: #ddd;
        cursor: not-allowed;
    }

    a.disabled:hover {
        background-color: #fff;
    }

    .clear-both {
        clear: both;
    }

    select {
        border: solid 1px #ddd;
        appearance: none;
        -moz-appearance: none;
        -webkit-appearance: none;
        background: url("../assets/images/arrow.png") no-repeat scroll right center transparent;
        padding-right: 15px;
        padding-left: 15px;
        padding-top: 2px;
        padding-bottom: 2px;
    }

    select::-ms-expand {
        display: none;
    }
</style>